Here's a map of Long Binh Post showing where things were located, including USARV HQ (1), HQ Special Troops, where I worked (10), and the swimming pool (33) and chapel (34):
http://www.chairborneranger.com/images/longbinhmap.htm
As you can see, we were in the same neighborhood, at least as far as where you bunked and where I worked. 
I arrived there in April '69, and I knew the CO of HQ Co. (who was married to a nurse who also was there at Long Binh at the time, working at either the 93rd or 24th evac. hosp.).
Everybody who worked at USARV HQ and some other support elements was assigned to Sp. Troops, so we had HQ Co., the WAC Detachment, the MP Co. (which guarded 'Long Binh Jail'), the Security Guard Detachment, etc.
My best friends there were the CO and XO of the Sec. Guard, a unit made up of hand-picked combat veterans assigned to guard the HQ and General Officers compound. Pete, the CO, had been a company commander with the 1st Cav and was recommendeded for the Medal of Honor (he was awarded the DSC). The XO, 'One-Nut,' had come from the 25th Inf. (and his nickname decribed the result of his combat wounds).
My short-lived assignment to Special Troops was a fluke, as incoming Infantry lts were supposed to be sent directly to a field unit. But the LTC commanding Sp. Troops had a vacancy, and the personnel who did the assignments at 90th 'Repo Depot' were all assigned to Sp. Troops, so the commander pretty much got whatever he wanted. So they grabbed me, and the LTC kept blocking my requests for transfer. It was only when the LTC's son, a Captain, came in as a transfer from the 101st to work in officer assignments on the hill that I was able to finagle a trf, with the Captain's help, out of the clutches of his dad (who was a good CO, and I had a good job--just not the right one).
My war ended in Feb. '70 when I got hit with AK fire in the face and shoulder while leading an Infantry platoon in the 101st. My little brother was there as a personnel clerk at our Div. HQ, and he saw me at the 85th evac. hospital the same day. After 5 days at the 85th and 95th I was medevac'd to an ICU in Japan for a week and then back to the states, where the Army released me from the hospital after 18 months and retired me for partial disability. As Dale Dye said in 'Platoon,' it was "a lovely fuckin' war."
Here's a pic of USARV HQ and some other links you might find interesting...
Bien Hoa Airbase and Long Binh Base
http://www.rjsmith.com/bien-hoa-long-binh-complete-02.html
US Army Vietnam HQ (1969)
http://www.flickr.com/photos/aodcurator/5064116717/in/set-72157620946947816
US Base at Long Binh 1971
http://www.flickr.com/photos/aodcurator/3687463180/in/set-72157620946947816
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